在ajax调用期间如何从Rails控制器方法返回值? [英] How to return value from a Rails controller method during an ajax call?

问题描述

<%= form_for(@mymodel, remote: true, html: { id: 'match_form' }) do |f| %>
        <!-- I need to check if @mymodel.match_id matches the value generated by a controller function -->
   <%= f.submit 'Save', class: 'btn btn-primary', id: 'match_submit', style: "width:38px;padding:0px" %> 
   <%= button_tag 'Cancel', class: 'btn btn-secondary', id: 'match_cancel', style: "width:52px;padding:0px" %>
<% end%>


<script type='text/javascript'>
    $(function() {
      $(document).on("click", "#match_submit", function(event){
        $.ajax('my_controller_method', {
          type: 'GET',
          dataType: 'script',
          data: {
            mid: $("#").val(),  // how do I pass @mymodel.match_id here?
          },
          error: function(jqXHR, textStatus, errorThrown) {
          return console.log("AJAX Error: " + textStatus);
        }
      });      
    });
  </script>

我有上面的JavaScrpt代码，可以对Rails控制器方法进行ajax调用.

I have the above JavaScrpt code which makes an ajax call to a Rails controller method.

我想检查在此ajax调用中传递的值是否与某个值匹配.如果没有，我想只用 Ok 按钮显示模式错误消息.

I would like to check if the value passed in this ajax call matches a certain value. If not, I would like to display a modal error message with only an Ok button.

我可以想到两种方法来实现这一目标:

I can think of 2 ways to achieve this:

1. 我可以从控制器方法中返回正确的值(这需要通过运行SQL查询进行一些计算.这就是为什么我在控制器方法中进行此操作)并检查JavaScript中的相等性，并在出现以下情况时抛出JavaScipt警报没有匹配项.

1. I can return the correct value from the controller method (this requires some calculation by running a SQL query. That's why I am doing this in a controller method) and check the equality in JavaScript and throw a JavaScipt alert if there is no match.

问:为此，我想知道如何从控制器函数(在ajax调用期间调用)将数字返回给JavaScript

Q: For this I would like to know how I can return a number from a controller function (called during ajax call) back to the JavaScript

我可以检查控制器本身内部的匹配项，然后在控制器函数本身中呈现引导程序模式

I could check for the match inside the controller itself and then render a bootstrap modal in the controller function itself

问:为此，我想知道如何在我的控制器函数中呈现一个引导程序模态(它显示一条文本消息，并且只显示一个 Ok 按钮".

Q: For this I would like to know how to render a bootstrap modal (which shows a text message and only an Ok button) inside my controller function.

推荐答案

def my_controller_method
 # assign your value here like,
 @message = 'Error occured!'
end

将js文件另存为

my_controller_method.js.erb

my_controller_method.js.erb

在此js文件中，

$("#mymodaldiv").html("<%= j render(partial: 'my_partial_page',locals: {msg: @message}) %>");

在这里，mymodaldiv是您必须在发生AJAX调用的文件中放入div的ID，

Here, mymodaldiv is the id of the div that you have to put in your file from where AJAX call is happening as,

<div id='mymodaldiv'></div>

和my_partial_page是您必须使用msg变量构造页面的部分的名称.

and my_partial_page is the name of your partial where you have to use msg variable to construct your page. as,

_my_partial_page.html.erb

_my_partial_page.html.erb

和文件_my_partial_page.html.erb中的代码类似，

and code in the file _my_partial_page.html.erb goes like,

<h1><%= msg %></h1>

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